Weakened cyclones, intensified anticyclones and recent extreme cold winter weather events in Eurasia

Extreme cold winter weather events over Eurasia have occurred more frequently in recent years in spite of a warming global climate. To gain further insight into this regional mismatch with the global mean warming trend, we analyzed winter cyclone and anticyclone activities, and their interplay with the regional atmospheric circulation pattern characterized by the semi-permanent Siberian high. We found a persistent weakening of both cyclones and anticyclones between the 1990s and early 2000s, and a pronounced intensification of anticyclone activity afterwards. It is suggested that this intensified anticyclone activity drives the substantially strengthening and northwestward shifting/expanding Siberian high, and explains the decreased midlatitude Eurasian surface air temperature and the increased frequency of cold weather events. The weakened tropospheric midlatitude westerlies in the context of the intensified anticyclones would reduce the eastward propagation speed of Rossby waves, favoring persistence and further intensification of surface anticyclone systems.

[1]  R. Reynolds,et al.  The NCEP/NCAR 40-Year Reanalysis Project , 1996, Renewable Energy.

[2]  Adam A. Scaife,et al.  Ensemble simulations of the cold European winter of 2005‐2006 , 2008 .

[3]  Arun Kumar,et al.  An Analysis of the Large-Scale Climate Anomalies Associated with the Snowstorms Affecting China in January 2008 , 2009 .

[4]  M. Tjernström,et al.  Warm winds from the Pacific caused extensive Arctic sea-ice melt in summer 2007 , 2011 .

[5]  Andreas H. Fink,et al.  Extraordinary snow accumulations over parts of central Europe during the winter of 2005/06 and weather‐related hazards , 2007 .

[6]  M. Serreze.  Climatological aspects of cyclone development and decay in the Arctic , 1995 .

[7]  Qigang Wu,et al.  Observed forcing‐feedback processes between Northern Hemisphere atmospheric circulation and Arctic sea ice coverage , 2010 .

[8]  M. Alexander,et al.  Atmospheric Response to Extreme Arctic Sea-Ice Conditions , 2002 .

[9]  R. Blender,et al.  IMILAST: A Community Effort to Intercompare Extratropical Cyclone Detection and Tracking Algorithms , 2013, Bulletin of the American Meteorological Society.

[10]  D. Stephenson,et al.  Observed Trends and Teleconnections of the Siberian High: A Recently Declining Center of Action , 2005 .

[11]  R. Gerdes,et al.  Atmospheric response to the extreme Arctic sea ice conditions in 2007 , 2012 .

[12]  Deliang Chen,et al.  Recent Recovery of the Siberian High Intensity , 2011 .

[13]  J. Wallace,et al.  Response of Sea Ice to the Arctic Oscillation , 2002 .

[14]  J. Wallace,et al.  The Arctic oscillation signature in the wintertime geopotential height and temperature fields , 1998 .

[15]  J. Walsh,et al.  Climatology and Interannual Variability of Arctic Cyclone Activity: 1948–2002 , 2004 .

[16]  J. Foster,et al.  Winter 2009–2010: A case study of an extreme Arctic Oscillation event , 2010 .

[17]  S. Vavrus,et al.  Evidence linking Arctic amplification to extreme weather in mid‐latitudes , 2012 .

[18]  Muyin Wang,et al.  Warm Arctic—cold continents: climate impacts of the newly open Arctic Sea , 2011 .

[19]  S. Yamane,et al.  Influence of low Arctic sea‐ice minima on anomalously cold Eurasian winters , 2009 .

[20]  J. Walsh,et al.  Arctic Sea Ice and Freshwater Changes Driven by the Atmospheric Leading Mode in a Coupled Sea Ice-Ocean Model , 2003 .

[21]  R. Barry,et al.  Icelandic low cyclone activity : Climatological features, linkages with the NAO, and relationships with recent changes in the Northern Hemisphere circulation , 1997 .

[22]  J. Chan,et al.  Synoptic-Scale Controls of Persistent Low Temperature and Icy Weather over Southern China in January 2008 , 2009 .

[23]  Muyin Wang,et al.  Large-scale atmospheric circulation changes are associated with the recent loss of Arctic sea ice , 2010 .

[24]  J. Kok,et al.  The physics of wind-blown sand and dust , 2012, Reports on progress in physics. Physical Society.

[25]  Adam A. Scaife,et al.  Seasonal forecasts of northern hemisphere winter 2009/10 , 2012 .

[26]  Rüdiger Gerdes,et al.  Recent radical shifts of atmospheric circulations and rapid changes in Arctic climate system , 2008 .

[27]  V. Petoukhov,et al.  A link between reduced Barents-Kara sea ice and cold winter extremes over northern continents , 2010 .

[28]  C. Deser,et al.  Evolution of Arctic sea ice concentration trends and the role of atmospheric circulation forcing, 1979–2007 , 2008 .

[29]  U. Ulbrich,et al.  Extra-tropical cyclones in the present and future climate: a review , 2009 .